蒸気タービン部材12Cr-Mo-W-V鋼の高温フレッティング疲労

概要

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Fretting fatigue tests at elevated temperatures were carried out using a 12 Cr-Mo-W-V steam turbine steel. The fretting reduced the fatgiue strengths by a factor of three at an elevated temperature (773 K) as well as at room temperature. The friction coefficients between the specimen and the contact pads increased in proportion to the appropriate stress amplitude, but attained saturation. No significant difference in this behavior of the friction coefficient was Observed between room and elevated temperatures. Predictions of fretting fatigue lives were made on the basis of the cyclic J-integral analysis proposed in the previous paper, where the frictional force between the fretting pad and the specimen was taken into consideration. The predicted lives were in good agreement with the experimental results both at room and elevated temperatures.
1989-04-25